EP9312-CB Cirrus Logic Inc, EP9312-CB Datasheet - Page 605

• Manufacturer Part Number: EP9312-CB
• Description: System-on-Chip Processor
• Manufacturer: Cirrus Logic Inc
• Series: EP9r

Specifications of EP9312-CB

• Peak Reflow Compatible (260 C): No
• A/d Converter: 12 Bits
• Leaded Process Compatible: No
• No. Of I/o Pins: 65
• Package / Case: 352-BGA
• Core Processor: ARM9
• Core Size: 16/32-Bit
• Speed: 200MHz
• Connectivity: EBI/EMI, EIDE, Ethernet, I²C, IrDA, Keypad/Touchscreen, SPI, UART/USART, USB
• Peripherals: AC'97, DMA, I&sup2:S, LCD, LED, MaverickKey, POR, PWM, WDT
• Number Of I /o: 16
• Program Memory Type: ROMless
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 3.6 V
• Data Converters: A/D 8x12b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Processor Series: EP93xx
• Core: ARM920T
• Data Bus Width: 32 bit
• 3rd Party Development Tools: MDK-ARM, RL-ARM, ULINK2
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: No
• Other names: 598-1257

DS785UM1
17.4.1.2 Frame Format
MIR uses a flag (reserved bit pattern) to denote the beginning and end of a frame of
information and to synchronize frame transmission. A double flag is used to indicate the start
of a frame and a single flag the end. The flag contains eight bits, which start and end with a
zero and contain six sequential ones in the middle (01111110b). This sequence of six ones is
unique because all data between the start and stop flag is prohibited from having more than
five consecutive ones. Data that violates this rule is altered before transmission by
automatically inserting a zero after five consecutive ones are detected in the transmitted bit
stream. This technique is commonly referred to as “bit stuffing” and is transparent to the user.
The information field within a MIR frame is placed between the start and stop flags, consisting
of an 8 bit address, an optional 8 bit control field, a data field containing any multiple of 8 bits
and a 16 bit cyclic redundancy check (CRC-CCITT). Note that each byte within the address,
control and data fields is transmitted and received LSB first, ending with the byte’s MSB.
However, the CRC is transmitted and received MSB first. The MIR frame format is outlined
below in
Start Flag
0111 1110
8 Bits
Table
17-3.
Start Flag
0111 1110
8 Bits
Figure 17-1. RZ1/NRZ Bit Encoding Example
Address
8 Bits
Table 17-3. MIR Frame Format
Copyright 2007 Cirrus Logic
(optional)
Control
8 Bits
Any multiple
of 8 Bits
Data
CRC-CCITT
16 Bits
Stop Flag
0111 1110
8 Bits
EP93xx User’s Guide
IrDA
17-9
17